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(No Model.)

- B. V. NORDBERG.

STEAM PUMP. No. 483,992. Patented Aug. 12, 1890.

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5 Sheets-Sheet 2.

(No Model.)

B. V. NORDBERG.

STEAM PUMP.

No. 433,992 Patented Aug. 12, 1890.

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5 Sheets-Sheet 3'.

(No Model.)

B. V.- NORD'BERG. STEAM PUMP.

Patented Aug. 12, 1890..

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Sheet 4.

5 Sheets (No Model.)

B. V. NORDBERG.

STEAM PUMP.

No. 433,992. Patented-Aug. 12, 1890.

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- B. V. NORDBERG.

STEAM PUMP.

@Patented Aug. 12,1890.

"A'rnNt BRUNO V. NORDBER G, OF MILWAUKEE, WVISCONSIN, ASSIGN OR TO THE BRUNO NORDBERG COMPANY, OF SAME PLACE.

STEAM-PUM P.

SPECIFICATION forming part of Letters Patent No. 433,992, dated August 12, 1890.

Application filed August 10I 1887- Serial No. 246,637. (No model.) I

I all whom, it may conccr'ncross-head H and rods K, or in any other Be it known thatl, BRUNO V. NORDBERG, of suitable manner, and piston D is coupled to Milwaukee, in the county of Milwaukee, and the piston D of the steam-engine, as shown in the State of Wisconsimhave invented cerin Fig. 8. 55

tain new and useful Improvements'in Steam- As steam'is let into the steam-cylinder my Pumps; and I do hereby declare that the folimproved pump willoperate as follows: Suplowing isa full, clear, and exact description pose piston D is in its extreme position and thereof. ready for forward stroke and piston D ready My invention relates to steam-pumps, and for backward stroke, and the pump is filled 6o will be fully described hereinafter. with fluid, with the valves all down in their in the drawings, Figure 1 is an elevation of seats. Now as piston D is drawn forward by my improved ,pump, looking from the rear. the piston of the engine we find that while Fig. 2 is a section on line it a: of Fig. 1. Fig. the piston-head is in the cylinder d it will 3 is a section taken through line y y, Fig. 4:. force the fluid through chamber B and up 65 :5 Fig. 4 is a section on line 5 5, Fig. 1. Fig. 5 through valves g into the discharge-chamber is a vertical central section, and Fig. 6 ahorib in a volume equal to the displacement of I z'ontal section, of a modified form of my inthe pistonhead, and fluid will be drawn by vention. Fig. '7 is a side elevation of my deit through port 6 from the chamber F, and vice, showing in connection therewith devices through the valves E from chamber E,whi0h 7o for adjusting the two pistons with relation to valves are therefore opened during this part each other; and Fig. 8 is a horizontal section of the stroke, as are also the discharge-valves on the dotted line shown in Fig. 7. g, while the valvesf are closed by the press A is the outer shell or casing of my pump, ure of fluid in the chamber B above them. and A its base. The shell or casing A is \Ve have also during this part of the stroke 75 z 5 formed with two compartments B, which exfull pressure on the piston D, correspondtend from the bottom of the casing to the ing to the pressure in the dischargepipe partition a, that separates it from the outletmultiplied by the full area of the piston-head, chamber b. and also the full steanrpressure in the steam- O is a partition that separates the compartcylinder; but when the piston-head passes out 80 o ments B from each other. On each side of of the cylinder d the steam is cut off from the the partition C the shell is provided with a steam-cylinder andthe chambers on each side flange (Z, which forms a short cylinder, and of the pump-piston head D come in communieach cylinder (1 has a port 6, that opens upcation with each other, and then the pressure ward from the rear, and from the inner teron each side thereof is equalizedthat is, we 85 mination of the cylinder d ribs d extend get the discharge-pressure on the back side to the partition 0 and form guides for the of the piston, which closes the valves Eand heads D of the pistons D and D after they during the rest of the stroke the volume of leave the cylinders (Z in their forward stroke. fluid discharged is equal to the displacement Above the path of each piston-head D is of the plunger, and the fluid will be forced 0 40 arranged a chamber E, which opens from inthrough valves g into the chamber 7) in vollet-port G and leads through suction-valves ume equal to the displacement of the piston- E into another chamber F, which latter are rod or plunger. The final pressure of the exeach connected with the rear of its subjacent panding steam 0n the steam-piston must be cylinder by a port e, and through cylindersd equal to or greater than the pressure on the 5 5 each with a chamber B. The chambers B piston D, which during this part of the and F on each side also communicate with stroke corresponds to the pressure in the diseach other through valves f, just beneath the charge-pipe multiplied by the area of the pisoutlet-chamber, and chambers B communiton-rod or plunger. In its backwardstroke cate with the outlet chamber 1) through plunger D as it retires will increase the ICC valves g. space in chamber B. in proportion to the.bulk The pistons D and D are connected by a of the plunger withdrawn, and create suction through chambers E and F until the pistonhead enters cylinder d, and then the fluid in chamber F will be forced out through valves f into chamber B, and at the same time fiuid will be drawn into F from E and be ready to be expelled by the next forward stroke. Eachpiston-head has a short plunger L in front of it, which fits in a short cylinder M on the partition O, and these cylinders'are connected attheir sides each with a chamber B by a pipe N, having a suitable valve or cook, by which the Water in the cylinder M is regulated in its escape to give the proper amount of cushioning resistance to the plunger.

While I have shown my invention as applied to a double-acting pump, it is obvious that it can'be equally as well applied to a single-action pump or to a double or single acting upright plunger.

While my pump is sufficiently powerful for all uses, it is economical, in that I am enabled for the greater part of each stroke to usesteam expansively. Instead of extending the cylinder (Z by ribs d, I may simply use a cylinder that is perforated for part of its length.

In the modification shown in Figs. 5 and 6 the pistons are connected with each other and with the engine-piston, as before described; but the valves f are omitted and the top of chamber F is made solid, so that the only communication between chambers B and F is through ports 6 and the cylinders cl. The piston-heads D are made hollow, each having a cross-piece p, and are connected to the ends of the pistons by bolts 19, each of which secures a flexible valve P and a cup-washer P to each piston, the convex portion of each washer P lying next to its valve and being sufficiently remote from it to permit the valve to open far enough for itspurposes.

In operation from the time piston D, for instance, begins to advance until it has carried the head D out of its cylinder d the water will be drawn by suction from the chamber E through valves E and chamber F, and after that the displacement of the piston as it enters will close valves E and force water out through valves g until the stroke is finished, and then on the return-stroke the retiring piston, leaving a vacuum, will again cause suction through valves E, which will continue until the stroke is finished, as the valve P, opening outward, will permit a free circulation, of water through the piston-head.

Figs. 7 and 8 are to illustrate one method of adjusting the pistons in a double-acting pump with relation to each other and the engine-piston to determine the point in the stroke of the pump-pistons at which direct steam-pressure shall cease and expansive pressure shall begin. In this instance the piston-rod D of the motor is provided with right-hand threads at its end next the pump,

the pitch of the former.

while the adjacent end of the pump-piston D has aloft-hand thread, the latter being double Both are tapped into a sleeve Q in the cross-piece H, and each has a limiting-nut 5, while the sleeve Q is held in the cross-piece H by a nut R. If it is desired to adjust the pump for an earlier cut-off than the device is set for in Fig.8 of the drawings, it will be necessary to bring the pump-pistons closer together, that they may sooner leave the solid part cl of the cylinder and sooner establish an equilibrium. To do this, it is necessary to loosen the nuts R and s and turn the sleeve Q, to the right when looking at the. the sleeve from the steam end of the pump, when both guide-rods and pumppistons will be drawn toward the steam-cylinder a certain distance, but at the same time.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The combination,with the suction and delivery chambers of a steam-pump, of a cylinder opening at one end to the suction-chamber and at the other to the delivery-chamber, and a piston working in and out of said cylinder, adapted for separating the suction and delivery chambers from each other during part of its stroke and for establishing communication between them during the remainder of the stroke, substantially as described.

2. In "a steam-pump, a cylinder having a port leading from the suction-chamber, and an extension that communicates with the delivery-chamber, in combination with a piston adapted to travel in the cylinder and extension alternately, said piston having a forcing action while in the cylinder proper anda mere displacing action when in the extension,substantially as described, and for the purpose set forth.

3. In a steam-pump, two chambers, the first chamber provided wit-h suction and delivery valves, the former sucking from the second chamber, which in its turn communicates with the suction-pipe through the suction-valves, a cylinder open at or near its ends, and a piston traveling therein beyond the open portions for separating the suction from the delivery-chambers during a portion of its stroke and for throwing them into communication during the remainder of the stroke, whereby the piston has at first a forcing action and then a mere displacing action during each stroke, substantially as described.

In testimony that I claim the foregoing I have hereunto set my hand, at Milwaukee, in the county of Milwaukee and State of \Viscousin, in the presence of two witnesses.

BRUNO V. NORDBERG. \Vitnesses:

S. S. STOUT, MAURICE F. FREAR.

IZC 

